staging/rdma/hfi1: use mod_timer when appropriate
Use new timer API to optimize maintenance of timers during ACK processing. When we are still expecting ACKs, mod the timer to avoid a heavyweight delete/add. Otherwise, insure do_rc_ack() maintains the timer as it had. Reviewed-by: NJubin John <jubin.john@intel.com> Signed-off-by: NMike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: NDoug Ledford <dledford@redhat.com>
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